如何使用bash脚本从文本文件替换一个文件中变量的值? [英] How to replace a value of variable in one file from text file using bash script?

问题描述

我有一个Makefile，我想在运行时使用bash脚本更改/替换变量的值.

I have one Makefile in which I want to change/replace the value of a variable during runtime with bash script.

Makefile内容:-

Makefile content:-

  SUBDIRS = common alarm coders crypto communication conup database \
            dynamicProtocols dynamethods dynamic TTStorage tables \
            jobManager logManager processManager \
            collection processing distribution mediationManager adaptations tools performanceMonitor \
            cli

现在，我希望将此SUBDIRS值替换为文本文件的内容.

Now I want this SUBDIRS value to be replaced with content of my text file.

文本文件内容:-

         database
         common
         jobManager
         coders
         process

此文本文件的内容可能在1到20个字之间.

This text file content may vary from 1-20 words.

现在，正如另一个线程中所建议的那样，我们在以下解决方案中使用了单个单词:-

Now as suggested in another thread, we used below solution for single word:-

        sed -r 's/(SUBDIRS = ).*/\1protocols/' Makefile

但这仅将第一行替换为协议".生成的输出是:-

But this only replaces first line with 'protocols'. Generated output is:-

      SUBDIRS = protocols
                dynamicProtocols dynamethods dynamic TTStorage tables \
                jobManager logManager processManager \
                collection processing distribution mediationManager adaptations tools performanceMonitor \
                cli

所需的输出是:-

           SUBDIRS = protocols

现在，我们要读取文本文件的所有内容并分配给SUBDIRS.如下所示:

Now, we want to read all contents of text file and assign to SUBDIRS. Shown below:

     SUBDIRS = database common jobManager coders process

请提出建议.

推荐答案

sed 方法:

sed approach:

sed -z -e 's/\n//g' -e "s/\(SUBDIRS = \).*/\1$(tr '\n' ' ' < words)\n/;" Makefile

• words 是一个文件名，包含1-20个单词以内的

  • words is a filename containing from 1-20 words

    -z -将输入视为一组行，每行以零字节结尾

    -z - treat the input as a set of lines, each terminated by a zero byte

    s/\ n//g -删除 Makefile

    $(tr'\ n'''< words)-将换行符转换为 words 文件

    $(tr '\n' ' ' < words) - translating newlines into spaces in the words file

    输出:

    SUBDIRS = database common jobManager coders process
    

    这篇关于如何使用bash脚本从文本文件替换一个文件中变量的值?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！